E34 #6 Spark plug oily - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-12-2008, 03:47 AM
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Question E34 #6 Spark plug oily

My #6 spark plug has a Little Bit of oil on the tip(electrode) after head removal, is this normal? and What causes it?
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#2 (permalink) Old 09-13-2008, 03:37 AM
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We really need more info to narrow the possible answers
Did u mean ONLY your #6 looks this way? How did the others look? mileage?
Blowing blue (oil) or black (Gas) exhaust? Fuel economy shot?
miles since changed?
In gerneral black sooty looking stuff is carbon from too rich a mixture, might also come from cold plug(wrong range plug or not torqued well)
Or can be excessive oil getting into cylinder from worn rings(bad) or worn valve guides(not quite so bad)
tell us more if you want, you are getting what you are paying for! lol
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#3 (permalink) Old 09-15-2008, 09:02 AM
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Quote:
Originally Posted by toml View Post
We really need more info to narrow the possible answers
Did u mean ONLY your #6 looks this way? How did the others look? mileage?
Blowing blue (oil) or black (Gas) exhaust? Fuel economy shot?
miles since changed?
In gerneral black sooty looking stuff is carbon from too rich a mixture, might also come from cold plug(wrong range plug or not torqued well)
Or can be excessive oil getting into cylinder from worn rings(bad) or worn valve guides(not quite so bad)
tell us more if you want, you are getting what you are paying for! lol
Yes it was only #6 and the others were OK!
You're right engine was running rich and still is, but the plugs are now OK. The engine has just been overhauled - New seals(Stem seals) polished valves, Rings Bearings, pumps etc. It Ran for the first time after the overhaul when i noticed the oil, Ok there's no more oil on my plugs, but I'm still running rich, black smoke, Plugs are covered by black powder on the electrodes!

When Idling my fuel consumption gauge shoots straight to the top and stays there! What could be the possible reason for this?
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